Malicious PDF — malware analysis report

Static analysis result for SHA-256 b370c44997f945e2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 18:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 037b4705e388285cbdb77d0346fa6956 SHA-1: 6f15c19dbe5a4085d114af207f742c6212b7b780 SHA-256: b370c44997f945e2588f105f76df56a96e48b94e55c5c3a8de37c0eb1f5a392a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates it likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a distribution mechanism for further payloads. The file's structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://millersexpress.com/userfiles/file/53496682601.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1e82416a---begixejisamobi.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61219788332.pdfIn PDF document text
    • https://agatanorek.com/files/file/80146024625.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100853569440.pdfIn PDF document text
    • https://granitnet.hu/editor_up/filexuzorakerominuruteber.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jorenipetefobokoduvononi.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/naziladibajawumifasat.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133dafe9326b---kezekonubekoru.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/64992889165.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354508b8a87---xexaxojoveludeketikefub.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/morimododatuben.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f021a104e7---vumirineref.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vevonupovimakug.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909093757.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2fbe91ad---72844354089.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/23e7fd3bbbe85d505a73f51991712483/95992557860.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bamagisutatumenadaxujege.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adea45f6de---turobugutufivozulejatudi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8000152d0---47254947663.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/livofen.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/16981468351.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/12590161970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+mania+mod+apk+2020+offlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10912 bytes
SHA-256: 7532c8c89dc1419a10ec4ebd30dbd83bd158428d3e2107bb3ee024ae786e5c97
font_02_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 17268 bytes
SHA-256: 96b1850c73934d12de693984f4d451837bcdc9384de882b503d444d0245a3d6b

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